cassandra-user mailing list archives

I can't see any advantage in using multiple keyspaces. It is highly unlikely
that several applications would share the same Cassandra cluster in any
nontrivial deployment.
Things more important than replication-factor, such as partitioner and ring
token distribution would be compromised by several apps sharing the same
cluster. Moreover, an application which was using Cassandra is likely to
have so much data to store that it can usefully benefit from many dedicated
nodes.
If you did decide that multiple keyspaces was the right thing to do, your
client tasks can simply maintain several connections to them (if they
individually need >1); this should not be a problem.
Mark